AvatarLegacy v.2

So basically in this commit I added lots of new features such as:

• Adding Skill-Trees
• A skilltree webeditor so that I don’t have to configure YAML
• Subelement trait chances
• Subelement runes

The idea of finding runes and special items in chests, this is how it works:
Instead of auto setting chest loot for unopened chests, the event for setting loot runs when the chest is opened at a high priority and it then uses the chance given from the configuration, and places/doesn’t place special items in the chest.

The /train command was also added, so that the avatar can be trained by other element masters. It takes 90 seconds and requires being close to each other.

Other updates were commit-ed on git :D